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WO1997013053A1 - Machine et procede de fraisage de cuvelage - Google Patents

Machine et procede de fraisage de cuvelage Download PDF

Info

Publication number
WO1997013053A1
WO1997013053A1 PCT/GB1996/002447 GB9602447W WO9713053A1 WO 1997013053 A1 WO1997013053 A1 WO 1997013053A1 GB 9602447 W GB9602447 W GB 9602447W WO 9713053 A1 WO9713053 A1 WO 9713053A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
drill string
milling
milling tool
casing
Prior art date
Application number
PCT/GB1996/002447
Other languages
English (en)
Inventor
Ronald James Bruce
Original Assignee
The Red Baron (Oil Tools Rental) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Red Baron (Oil Tools Rental) Limited filed Critical The Red Baron (Oil Tools Rental) Limited
Priority to CA002232940A priority Critical patent/CA2232940C/fr
Priority to US09/051,209 priority patent/US5988272A/en
Priority to EP96932728A priority patent/EP0853715B1/fr
Priority to AU71404/96A priority patent/AU702102B2/en
Publication of WO1997013053A1 publication Critical patent/WO1997013053A1/fr
Priority to NO19981266A priority patent/NO310631B1/no

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/20—Drives for drilling, used in the borehole combined with surface drive
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe

Definitions

  • casing steel liner which is known as a "casing". From time to time, it is necessary to replace all or part of such casings. Whilst, on occasions, it may be possible to remove large sections of casing intact it is recognized that under certain circumstances casing can only be removed by milling. Milling is carried out by running a tool having appropriate milling formations into the casing on a tubing string, and rotating the string to rotate the tool and thereby mill away the material of the casing.
  • a well recognized problem which occurs during milling operations of this type is that the swarf formed by the milled casing material includes long strands which cannot easily be cleared from the milling tool by a conventional mud flushing techniques. These long strands tend to form "birdsnests" which can impair operation of the milling tool and, m extreme cases, cause jamming of the milling tool and the remainder of the milling assembly.
  • the milling tool should be designed to produce small swarf at an optimum high operating speed and that the tool should be rotated at that high operating speed.
  • the rotational speed of a milling tool connected to the string may vary from nothing up to a speed several times faster than the nominal rotational speed of the string.
  • the same tool may intermittently produce long swarf in use as a result of the unavoidable variations in actual milling speed.
  • the above problem is alleviated by incorporating within a downhole assembly which includes a milling tool and is connected to a drill string, a motor which is located adjacent the milling tool and which is effective to rotate the milling tool relative to the drill string in the direction of rotation of the string.
  • the actual speed of rotation of the milling tool will be equal to the sum of the speed of rotation of the string immediately uphole of the motor, and the speed of rotation of the motor. Because the motor is located relatively close to the milling tool there is very little variation between the speed of rotation of the milling tool and the speed of rotation of the output shaft of the motor - i.e. there is very little facility for the intervening components to absorb relative rotation by torsional displacement. Thus, even if the speed of rotation of the drill string immediately uphole of the
  • SUBSTITUTE SHEET (RULE 26 ⁇ motor varies as a result of, for example, varying resistance to rotation of the drill string as the string rotates, the milling tool will be rotated at a speed at least equal to the rotational speed of the motor at all times, and any variation in the speed of rotation of the milling tool due to variations in the speed of rotation of the drill string adjacent the downhole assembly will amount to a relatively small percentage speed variation superimposed on the substantially constant rotation produced by the motor.
  • the motor is a fluid motor which is operated by fluid pumped through the drill string.
  • the motor may be a positive displacement mud motor operated by mud pumped through the drill string.
  • the mud after exiting the motor, is directed to remove and clear swarf from the mill and to carry the swarf up to annulus to the surface for removal and disposal.
  • a typical downhole assembly for use in an embodiment of the present invention comprises (from bottom to top) :
  • the jet sub is desirable since it allows for a higher rate of mud flow than the motor can usefully use and assists in the back flow (lift) of cuttings to the surface.
  • a drilling rig may be utilised to rotate a drill string at a nominal 70rpm and with a mud flow rate sufficient to operate a downhole mud motor and provide for effective clearing of swarf.
  • a mud motor forming part of the downhole assembly may have an output shaft which rotates at 235rpm relative to the body of the motor. Since the body itself will rotate at an average of 70rpm (the speed of rotation of the rotary table) , the total speed of rotation of the output shaft of the motor, and thus the speed of rotation of the milling tool, will average 305rpm.
  • the speed of rotation of the milling tool should never be less than the speed of rotation of the motor - i.e. never less than 235rpm.
  • the rotational speeds quoted should be regarded as only typical for one installation. If desired, higher or lower rotational speeds may be effected by varying the nominal rotational speed of the string or the speed of the motor by appropriate selection of drive components .
  • shock sub is included in the proposed assembly, such a sub may be included. However, it is believed that the bearing assembly and the design of the motor compensate for the shock sub and behave in a similar fashion .
  • a particular advantage of the present invention is that an appropriate cement removing tool may be incorporated in the downhole assembly some distance above the mill.
  • an appropriate tool may be located approximately 180 feet above the mill.
  • the noted variations in the rotational speed of the drill string at this point will not adversely affect the operation of a typical cement removing tool. Cement cuttings so removed will be circulated out of the hole with the drilling mud and rate of penetration will not be effected. Accordingly, the need for a separate run to remove the cement liner is removed .
  • the downhole assembly includes a THRUSTER (Trade Mark) .
  • THRUSTER Trade Mark
  • This is a hydraulic feed tool which achieves a constant weight on the milling tool and thus gives smooth running and optimum penetration.
  • the illustrated downhole assembly 1 would, in use, be mounted on the bottom of drill string.
  • the drill string would, in use, be rotated m conventional manner for a suitable drilling rig.
  • the top component of the illustrated assembly is a drilling ]ar 2 which is connected by one or more collars 3 to a j e t sub 4.
  • the jet sub 4 allows part of the mud flow through the drill string to be diverted into the annulus surrounding the assembly and thereby assist lift of cuttings and other debris to the surface.
  • the jet sub 4 is connected to an undergauge stabilizer 5 which in turn is connected to a mud motor 6.
  • the mud motor 6 may be of any suitable design and is powered by mud supplies through the drill string from the surface .
  • the output shaft of the motor 6 is connected by a crossover 7 to a stabilizer 8 which is in turn connected to a casing mill 9.
  • the casing mill 9 is designed to operate at a relatively high rotational speed to disintegrate the casing into chips or short strands.
  • the optimum rotational speed of the casing mill 9 will typically be equal to the sum of the nominal rotation speed of the drill string and the operating speed of the motor 6. It is to be understood, however, that under certain circumstances it may be desirable for the optimum speed of operation of the casing mill 9 to be somewhat different from the sum of the drill string speed and the motor operating speed.
  • the mill 9 is connected by stabilizers 10 to a taper mill 11 which forms the bottom of the assembly.
  • the assembly may, if desired, incorporate a hydraulic feed tool which produces a constant weight on the milling tool in use of the assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Milling Processes (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

Cette machine, qui permet de fraiser le cuvelage d'un puits de pétrole ou de gaz, comprend un ensemble de forage descendant dans le puits grâce à un train de tiges rotatif. Cet ensemble comporte un moteur (6) dont le corps est relié au train de tiges et dont l'arbre de sortie est relié à une fraise (9) de cuvelage. Pendant le fonctionnement, le train de tiges tourne dans une direction de rotation et le moteur (6) fait tourner son arbre de sortie dans la même direction de rotation, ce qui donne à la fraise (9) une vitesse de rotation supérieure à celle du train de tiges. La vitesse de rotation de la fraise (9) ne pouvant être inférieure à celle de l'arbre de sortie du moteur (6) par rapport au corps de ce dernier, on évite des variations extrêmes de la vitesse de rotation de la fraise dues à la torsion longitudinale du train de tiges. L'ensemble de forage peut comprendre une fraise conique (11), des stabilisateurs (10, 8, 5) et un raccord à jet (4), ainsi, éventuellement, qu'un dispositif à poussée constante, donnant une charge à poussée pratiquement constante appliquée à la fraise, et un ou plusieurs outils d'élimination du ciment.
PCT/GB1996/002447 1995-10-05 1996-10-07 Machine et procede de fraisage de cuvelage WO1997013053A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002232940A CA2232940C (fr) 1995-10-05 1996-10-07 Machine et procede de fraisage de cuvelage
US09/051,209 US5988272A (en) 1995-10-05 1996-10-07 Apparatus and method for milling a well casing
EP96932728A EP0853715B1 (fr) 1995-10-05 1996-10-07 Machine et procede de fraisage de cuvelage
AU71404/96A AU702102B2 (en) 1995-10-05 1996-10-07 Apparatus and method for milling a well casing
NO19981266A NO310631B1 (no) 1995-10-05 1998-03-20 Anordning og fremgangsmåte for fresing av brönnforingsrör

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9520347.7 1995-10-05
GBGB9520347.7A GB9520347D0 (en) 1995-10-05 1995-10-05 Milling of well castings

Publications (1)

Publication Number Publication Date
WO1997013053A1 true WO1997013053A1 (fr) 1997-04-10

Family

ID=10781817

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/002447 WO1997013053A1 (fr) 1995-10-05 1996-10-07 Machine et procede de fraisage de cuvelage

Country Status (7)

Country Link
US (1) US5988272A (fr)
EP (1) EP0853715B1 (fr)
AU (1) AU702102B2 (fr)
CA (1) CA2232940C (fr)
GB (1) GB9520347D0 (fr)
NO (1) NO310631B1 (fr)
WO (1) WO1997013053A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7862834B2 (en) 2003-05-28 2011-01-04 Novartis Pharma Ag Pharmaceutical formulation comprising a water-insoluble active agent

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6202752B1 (en) * 1993-09-10 2001-03-20 Weatherford/Lamb, Inc. Wellbore milling methods
US6547006B1 (en) * 1996-05-02 2003-04-15 Weatherford/Lamb, Inc. Wellbore liner system
US6715567B2 (en) * 2001-05-02 2004-04-06 Weatherford/Lamb, Inc. Apparatus and method for forming a pilot hole in a formation
US6786282B2 (en) * 2001-06-25 2004-09-07 Schlumberger Technology Corporation Milling apparatus and method for a well
US20060079892A1 (en) * 2001-10-31 2006-04-13 Suranjan Roychowdhury Adjustable tandem connectors for corrective devices for the spinal column and other bones and joints
US6668945B2 (en) 2001-11-13 2003-12-30 Schlumberger Technology Corp. Method and apparatus for milling a window in a well casing or liner
US7971645B2 (en) * 2009-04-03 2011-07-05 Baker Hughes Incorporated Four mill bottom hole assembly
CA2798839A1 (fr) * 2010-05-24 2011-12-01 Schlumberger Canada Limited Procede de formation d'encoches dans un tubage de puits de forage

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280769A (en) * 1940-02-12 1942-04-21 John S Page Casing cutter
CH464726A (fr) * 1965-11-30 1968-10-31 Commissariat Energie Atomique Machine pour effectuer une opération d'usinage dans une surface intérieure d'un tube
US4137975A (en) * 1976-05-13 1979-02-06 The British Petroleum Company Limited Drilling method
EP0231989A2 (fr) * 1986-01-06 1987-08-12 Tri-State Oil Tool Industries Inc. Outil de fraisage pour couper un tubage de puits
US4717290A (en) * 1986-12-17 1988-01-05 Homco International, Inc. Milling tool
US4775017A (en) * 1986-04-11 1988-10-04 Drilex Uk Limited Drilling using downhole drilling tools
GB2211446A (en) * 1987-10-26 1989-07-05 Houston Engineers Inc Offshore well leg internal cutting apparatus
EP0385673A1 (fr) * 1989-02-24 1990-09-05 Smith International, Inc. Outil de fraisage pour fond de puits et élément de coupe pour cet outil
GB2248792A (en) * 1990-10-16 1992-04-22 Red Baron Tubing cutting tool.
US5265675A (en) * 1992-03-25 1993-11-30 Atlantic Richfield Company Well conduit cutting and milling apparatus and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059165A (en) * 1975-12-08 1977-11-22 Wallace Clark Versatile fluid motor and pump
US4144936A (en) * 1977-06-16 1979-03-20 Smith International, Inc. Down hole milling or grinding system
US5431219A (en) * 1994-06-27 1995-07-11 Dowell, A Division Of Schlumberger Technology Corp. Forming casing window off whipstock set in cement plug
US5584350A (en) * 1995-09-22 1996-12-17 Weatherford U.S., Inc. Wellbore sidetracking methods
US5860474A (en) * 1997-06-26 1999-01-19 Atlantic Richfield Company Through-tubing rotary drilling

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280769A (en) * 1940-02-12 1942-04-21 John S Page Casing cutter
CH464726A (fr) * 1965-11-30 1968-10-31 Commissariat Energie Atomique Machine pour effectuer une opération d'usinage dans une surface intérieure d'un tube
US4137975A (en) * 1976-05-13 1979-02-06 The British Petroleum Company Limited Drilling method
EP0231989A2 (fr) * 1986-01-06 1987-08-12 Tri-State Oil Tool Industries Inc. Outil de fraisage pour couper un tubage de puits
US4775017A (en) * 1986-04-11 1988-10-04 Drilex Uk Limited Drilling using downhole drilling tools
US4717290A (en) * 1986-12-17 1988-01-05 Homco International, Inc. Milling tool
GB2211446A (en) * 1987-10-26 1989-07-05 Houston Engineers Inc Offshore well leg internal cutting apparatus
EP0385673A1 (fr) * 1989-02-24 1990-09-05 Smith International, Inc. Outil de fraisage pour fond de puits et élément de coupe pour cet outil
GB2248792A (en) * 1990-10-16 1992-04-22 Red Baron Tubing cutting tool.
US5265675A (en) * 1992-03-25 1993-11-30 Atlantic Richfield Company Well conduit cutting and milling apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7862834B2 (en) 2003-05-28 2011-01-04 Novartis Pharma Ag Pharmaceutical formulation comprising a water-insoluble active agent
US8668934B2 (en) 2003-05-28 2014-03-11 Novartis Ag Pharmaceutical formulation comprising a water-insoluble active agent

Also Published As

Publication number Publication date
CA2232940A1 (fr) 1997-04-10
US5988272A (en) 1999-11-23
AU702102B2 (en) 1999-02-11
EP0853715A1 (fr) 1998-07-22
NO981266D0 (no) 1998-03-20
NO310631B1 (no) 2001-07-30
AU7140496A (en) 1997-04-28
CA2232940C (fr) 2005-01-04
EP0853715B1 (fr) 2000-03-01
NO981266L (no) 1998-03-20
GB9520347D0 (en) 1995-12-06

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